Antibacterial auxiliary agent comprising kombu extract as active ingredient, antibacterial composition, and food or beverage

Abstract

Disclosed are: a method for utilizing a kombu (kelp) extract as an antibacterial auxiliary agent; and a method for utilizing a combination of the antibacterial auxiliary agent, lactoperoxidase, glucose oxidase and glucose as an antibacterial composition having a potent antibacterial activity. Specifically disclosed are: an antibacterial auxiliary agent comprising a fraction having a molecular weight of 5000 or less and produced from a kombu extract as an active ingredient; an antibacterial composition comprising the antibacterial auxiliary agent, lactoperoxidase, glucose oxidase and glucose; an antibacterial composition as mentioned above, which additionally comprises xanthane gum; and a food or beverage containing the antibacterial composition.

1 . An antibacterial supplement comprising a fraction having a molecular weight of 5000 or less obtained from a kombu extract, as an active ingredient. 
     
     
         2 . The antibacterial supplement according to  claim 1 , wherein said antibacterial supplement is used in an antibacterial composition with lactoperoxidase system. 
     
     
         3 . The antibacterial supplement according to  claim 1 , wherein the kombu extract is an extract of one or more of kombu selected from the group consisting of makombu ( Laminaria japonica ), rausu kombu ( Laminaria diabolica ), rishiri kombu ( Laminaria ochotensis ) and hidaka kombu ( Laminaria angustata ). 
     
     
         4 . An antibacterial composition comprising the antibacterial supplement according to  claim 1 , lactoperoxidase, glucose oxidase and glucose. 
     
     
         5 . The antibacterial composition according to  claim 4 , wherein the antibacterial composition further contains xanthan gum. 
     
     
         6 . Food and drink containing the antibacterial composition according to  claim 4 . 
     
     
         7 . A method for preparing an additive for lactoperoxidase system comprising obtaining a kombu extract by performing the extraction from kombu with a solvent(s), fractionating the kombu extract into a fraction having a molecular weight of 5000 or less. 
     
     
         8 . The method according to  claim 7 , wherein the solvent is water or aqueous solution. 
     
     
         9 . An additive for lactoperoxidase system, including a fraction having molecular weight of 5000 or less obtained from a kombu extract, as an active ingredient, prepared by the method according to  claim 7 .